The U.S. government has several reputable databases dealing with toxicology, hazardous chemicals, environmental health, and toxic releases. This guide provides a starting point to help you select the right resource for your needs. The database table has expanded descriptions and sample records for some of these resources.

A Geographic Information System (GIS) from the National Library of Medicine (NLM) that uses maps of the United States to help users visually explore data from the EPA's Toxics Release Inventory (TRI) http://www.epa.gov/tri/ and Superfund Programs http://www.epa.gov/superfund/.